I'm sure it's just a figment of my imagination, but I've always envisioned the Quylthulgs as some frightening Lovecraftian off-spring of Cthulhu out of the mind of H.P. Lovecraft.

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“We're more of the love, blood, and rhetoric school. Well, we can do you blood and love without the rhetoric, and we can do you blood and rhetoric without the love, and we can do you all three concurrent or consecutive. But we can't give you love and rhetoric without the blood. Blood is compulsory. They're all blood, you see.”
― Tom Stoppard, Rosencrantz and Guildenstern are Dead